Abstract
The acid catalysed hydrolyses of N-acetyl and a series of N-aroylsulphonimidic esters have been studied in aqueous 40% (v/v) dioxane solutions of mineral acids. At low acidity all the esters studied are considered to hydrolyse by an A-2 mechanism. At higher acidities a changeover to an A-1 mechanism is observed for N-aroylsulphonimidic esters.